"service manual"
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1. in the seal assembly The reassembly procedures from this point will depend on the type of pump and the number of stages it contains Refer to diagrams on pages 17 21 to determine the proper sequence of impellers Pos 49 or 49a Chambers Pos 4 4a Spacers Pos 64 a c d and Bearing Ring Pos 47a needed for the pump you are working with Reassemble these stages in the order Placethe Clamp Spacer Pos 64c onto shown beginning with the highest the shaft number stage and continue to the first stage Then continue GRUNDFOS 9 Reassembly Procedures CR CRI CRN 1se1 3 5 The Lock Washers Pos 66 come as a set If they become separated it is important the Lubricate the threaded end of the washers are repositioned correctly as noted in the diagram The tabs should interlock shaft with an FDA approved lubricant while the serrated edges both point outward Place the washers onto the shaft Thread the Lock Nut Pos 67 onto the shaft and torque to 13 3 ft lbs 18 Nm Spray soapy water on the Sleeve O rings Pos 37 or 37b Lower and press the Sleeve Afterthe Bottom Chamber Pos 5a has Pos 55 firmly into place If the sleeve does not slide easily over the O ring STOP been placed ontothe stack removethe Remove the sleeve and sleeve O ring Stretch the O ring place the O ring back into the stack assembly from the shaft holder groove of the housing and proceed with sleeve installation and turn it ov2. GRUNDFOS CR SERVICE MANUAL CR CRI CRN 1S 1 3 5 Dismantling amp Reassembly CONTENTS Dismantling Procedures When Should A Part Be Replaced 0 0 eeessseseeseees Page 8 Reassembly Procedures Setting The Coupling Height Order of Stage Assembly CR I N 1S 1 3 Order of Stage Assembly CR N 3 Low NPSH Order of Stage Assembly CRNE 1 3 High Speed Order of Stage Assembly CR I N 5 Order of Stage Assembly CR N 5 Low NPSH CR Series TORQUES Position Number 7a Coupling Guard Screw 2 ft Ibs 2 5 Nm 9 Coupling Hex Screw M6 Screw 10 ft Ibs 13 Nm M8 Screw 20 ft lbs 27 Nm M10 Screw 46 ft lbs 62 Nm Motor Bolt UNC 3 8 Bolt 10 ft lbs 13 Nm UNC 1 2 Bolt 23 ft lbs 31 Nm Staybolt Nut 29 ft lbs 40 Nm 37 ft lbs 50 2 Nm Shaft Lock Nut 13 3 ft lbs 18 Nm Shaft Seal 26 ft lbs 35 Nm 2 ft lbs 2 5 Nm Hex Screw for Pos 147 148 6 ft lbs 8 13 Nm Stationary Seal Retainer 26 ft Ibs 35 Nm Connecting Pipe 26 ft lbs 35 Nm innovate GRUNDFOS YX Dismantling Procedures CR CRI CRN 1se1 3 5 These instructions cover the repair of stack after the pump has been isolated from the system Before removing the pump from the system make sure all valves are closed Relieve any built up pressure by opening the vent plug screw The power source should be turned off and locked out before starting any work Removal of field ns wiring to the motor wires may be Using a
3. Star Washer Spacing Pipe 64c Clamp 4a 4 5a 2 Chamber with 5 Chamber CPL Bottom Bearing Chamber CPL _ m A i J Chamber CPL 49 49 Impeller Impeller Impeller Part Combination A Part Combination B Part Combination C Part Combination D los se ee oe oan Number of chambers 9 21 23 25 27 29 30 31 33 36 ba Bottom ETE NOTES 1 If an impeller is to be permanently removed pump destaged the thickness of the impeller back plate hub area must be compensated for Use a longer spacer or combination of spacers that equal the thickness of back plate hub area material 2 Since proper reassembly of the impeller stages must be done upside down this chart has been arranged that way for your convenience Impeller eyelet opening faces upward away from vise Begin reassembly on this end i 8 GRUNDFos Reassembly Procedures CR CRI CRN 1se1 3 5 Order of Stage Assembly Models CRNE 1 3 High Speed Legend 49 Impeller 64a Spacing Pipe 67 Lock Nut 43 Impeller 49 142 Impeller 66 64a Upper Guide Ring Star Washer Spacing Pipe 137 4 Lower Guide Ring Chamber CPL 143 Corrugated Spring 139 O ring 64 Spacing Pipe 138 O ring Retainer 4a Chamber with Bearing 4la Bearing Ring 4a 64b Chamber with Spacing Pipe Bearing 2 D O Ni J 4la Bearing Ring Part Combination A Part Combination B Part Combination C 49 Impeller 5a Rein
4. a light machinery oil onto the torque Coupling Bolts Pos 9 Install bolts Install Motor Bolts Pos 28 and Place Shaft Pin Pos 10 into the Shaft diagonally tighten to the proper Pos 51 UNC 3 8 bolt 10 ft Ibs 13 55 Nm loosely into coupling halves UNC 1 2 bolt 23 ft lbs 31 Nm GRUNDFOS 4 15 Reassembly Procedures CR CRI CRN 1s 1 3 5 33 Standard and Tandem 33 Back to Back Ga _ Equipped Seal Models Equipped Seal Models CORRECT Top View Gap between coupling i F A S p Keyway Keyway Paaa _ u 6 Using a screwdriver lift the shaft to Spring tension from the Inboard Seal its full travel upward lower half the forces the shaft upward Lower the distance and torque coupling bolts shaft to its full travel downward then aLL M6 to 10 ft Ibs 13 Nm allow it to return half the distance M8 to 23 ft Ibs 31 Nm upward and torque coupling bolts CORRECT NOT CORRECT M10 to 46 ft lbs 62 Nm es Paes ee Ensure the gap between the M10 to 46 ft lbs 62 Nm two coupling halves is even Tandem Seal Equipped Pump Only Spin the shaft by hand proceed only Use specialty Torque Screwdriver 00SV0438 extension fitting from Bits Kit 0OSV2010 if the shaft spins freely If the shaft and 2 5m bit 00SV2012 to torque to Inboard Shaft Seal Securing Screws Pos 113 Insert does not spin freely stop and start tool in through the plug holes of the Pump Head Pos 77a Torque to 2 ft lbs 2 5 Nm ove
5. e pump housing NOTE Light blows with a rubber mallet may be required to free sleeve THE PUMP IS NOW COMPLETELY DISASSEMBLED Using a screwdriver remove Corrugated Spring Pos 60 For standard CR remove the Outer Sleeve O ring Pos 37 from the Motor Stool Pos 2 For CRI CRN Cool Top Back to Back Seal or Tandem Seal equipped pumps remove the O rings from the Pump Head Pos 77 and Pump Head Cover Pos 77a Note The Corrugated Spring is located in the pump head cover On all models remove the Sleeve O ring from the Suction Discharge Chamber Pos 6 GRUNDFOS gt 4 7 Reassembly Procedures CR CRI CRN 1s 1 3 5 When Should A Part Be Replaced Part Motor Stool Suction Discharge Chamber Chambers Neck Ring Bearing ring Impellers Shaft Sleeve Corrugated Spring Spacers amp Clamp Lock Nut Lock Washers O rings Shaft Seal Connecting Pipe Position s 2 4a 4 45 47a 49 51 55 60 64 64a 64c 66 66b 69 67 66 37 38 68 100 102 109a amp b 105 149 8 GRUNDFOS X Minimum Operating Condition Excessive pitting of these castings could cause leaks Rusted castings should have all seating areas cleaned to ensure proper seating of O rings Same as for impellers The maximum inside diameter for the bearing in position 4a is 17 52 mm If a groove can be seen or felt the chamber should be replaced Should be free of visible w
6. ear on the inside edges Inside diameter for CR 1s 1 amp 3 30 6 05 mm Inside diameter for CR5 25 01 mm Minimum outside diameter is 17 349 mm Ifa groove can be seen or felt the bearing should be replaced Should be free from physical markings except for the guide vane welds The eyelet or contact surface for the Neck Ring should not show any signs of wear 1 Cavitation the implosion of vapor bubbles within the impeller stack Make sure the Net Positive Suction Head Available for the pump meets the minimum Net Positive Suction Head Required for the pump when running at the required flow 2 Improper coupling height If the coupling is not set to the proper height see step 33 of the Reassembly procedures the impellers are not suspended as they should be causing them to rub against the chambers causing wear Smooth area at the top of shaft should be free of fitting grooves Spline should not be worn Should not be pitted or cracked Should not have any cracks in material Should show no signs of gouging or wear at bottom or top Should not be reused replace Should not be reused replace Should be soft and pliable with no visible scars Since they are easily damaged and fairly inexpensive it is recommended they be replaced whenever the pump is disassembled Seals mfg after January 2003 cannot be disassembled should be replaced when repairing rebuilding the pump If bushing is scored rep
7. er Lower the stack into the Suction Discharge pump housing Ifthe Top Guide Vane Pos 50a has not already been placed onto the stack add this now Standard CR I N models skip to step 25 Cool Top models skip to step 13 Back to Back Seal models skip to step 16 Tandem Seal models skip to step 23 10 GRUNDFos Reassembly Procedures CR CRI CRN 1se1e3e5 Cool Top Cool Top my P Place O rings Pos 109a amp b onto the Connecting Pipe Pos 149 Do not roll the O rings they should be stretched over and released into place to prevent cutting the material during installation into the housing Spray soapy solution onto O rings and housing Screw the connection pipe into the prepped Cool Top Assembly Pump Head Cover Pos 77a Using a 36 mm wrench or deep socket torque to 26 ft lbs 35 Nm Spray soapy solution into the center hole of the Disk Plate Pos 79 and press the plate firmly in place Before proceeding to step 15 flip the Pump Head over make sure the Corrugated Spring Pos 60 and the Sleeve O ring Pos 37b have been installed from steps 1 and 2 If they have not been installed follow the instructions in those steps then proceed to step 15 Position the plugs to the desired location lowerthe completed Cool Top Pump Head Assembly Pos 77a over the shaft and seat on the Sleeve Pos 55 If it does not freely seat onto the sleeve STOP Remove the pump head and turn over Remove sleeve O rin
8. forced Chamber CPL Bottom EE 64a Spacing Pipe 64 Spacing Pipe Part Combination D NOTES 1 If an impeller is to be permanently removed pump destaged the thickness of the impeller back plate hub area must be compensated for Use a longer spacer or combination of spacers that equal the thickness of back plate hub area material 2 Since proper reassembly of the impeller stages must be done upside down this chart has been arranged that way for your convenience Impeller eyelet opening faces downward toward vise GRUNDFOS X 19 Reassembly Procedures CR CRI CRN 1se1 3 5 Order of Stage Assembly Models CR I N 5 Legend P 47a 67 47a g Bearing Ring Lock Nut Lock Nut lt Bearing Ring 66 4a l Star Washer 4a Chamber with 66 i Beari Star Washer K amp Chamber with aa earing 64c Bearing Clamp 64a 64c 64a Spacing Pipe camp 64d Spacing Pipe Spacing Pipe hl i mpeller Rao A 49 49 Impeller Impeller 69 Spacing Pipe Part Combination A Part Combination A Part Combination B Part Combination B L nL Number of chambers Se if e s AN l hn or w oa g gt n Bottom dee 4 a 4 Chamber CPL 2 Chamber CPL 64 l 64 Spacing Pipe Spacing Pipe ONNSHEHRHHKEHNBHGONOERENE 49 Impeller NEN U Ae 49 Impeller 69 Spacing Pipe Part Combination C Part Combination D NOTES 1 If an impeller is to be permanently removed pum
9. g and stretch Replace and reinstall the pump head onto shaft and sleeve Skip to step 25 GRUNDFOS gt 4 11 Reassembly Procedures CR CRI CRN 1se1e3 5 Back to Back Seal Back to Back Seal a a liad i Place O rings Pos 109a onto the threaded Stationary Seal Retainer Pos 147 Do not roll the O ring instead stretch it over and release into place This will prevent cutting the material during installation into the housing Spray soapy solution onto O ring and housing Screwthe stationary seal retainer into the prepped Pump Head Cover Pos 77a Using the specialty tool OOSV2007 or a 36 mm deep socket torque to 26 ft Ibs 35 Nm Before proceeding to step 17 flip the Pump Head over Make sure the Corrugated Spring Pos 60 and the Sleeve O ring Pos 37b have been installed from steps 1 and 2 If they have not been installed follow those instructions and proceed to step 17 Place O ring Pos 102 onto the Stationary Seal Pos 103 Spray soapy solution onto the O ring and press onto the threaded seal retainer Place the Retaining Ring Pos 148 over the seal Install the three 2 5 mm Hex Screws Pos 146 Torque screws to 6 ft lbs 8 13 Nm 2 GRUNDFOS 112b Seal Driver 113 with screws 112 Large Seal Driver 108 Seal Spring 111 Small Seal Driver 107 O ring 104 Rotating Seal Ring 148 Stationary Ring Retainer 103 Stationary Seal Ring 102 Reassembl
10. l OOSV0234 ontothe threaded section of shaft Using a hammer drive punch down past the hub of the first impeller Noting chart instructions in step 23 remove each impeller Pos 49a and Chamber with bearing Pos 4a and Chamber Pos 4 Repeat these steps until you get down to the last impeller At that time gently knock the punch down through the hub area make sure to catch the shaft as it falls free Go to step 24 The dismantling procedures from this point will depend on the type of pump and number of stages it contains Beginning on page1 refer to the charts in the Reassembly Procedures to determine what you can expect with the pump you are working on Remove all the Bearing Rings Pos 47a and Spacers Pos 64a c d youencounter while repeating steps 20 22 Continue until you remove the last impeller Remove the shaft and examine for damage At that point continue Using the Puller for Neck Ring material OOSV0239 to work the Seal Ring Retainer Pos 65 loosen and remove Remove Seal Ring Pos 45 Dismantling Procedures CR CRI CRN 1se1e3 5 If the pump shows leakage around the sleeve Pos 55 removal of the sleeve may be If the Bottom Chamber Pos 5a has required Grip the Staybolts Pos 26 diagonally Using your thumbs press against the not already been removed use a sleeve to release it from the Suction Discharge pump housing Pos 6 Lift off sleeve screwdriver to pry it out of th
11. lace Refer to the Parts List and Kits section for a list of material numbers and spare pare kits To Install Corrugated Spring Pos 60 For standard CR install into the Motor Stool Pos 2 For CRI CRN install into Pump Head Pos 77 For Cool Top Back to Back Seal amp Tandem Seal install into the Pump Head Cover Pos 77a Edges of spring must point downward as shown for all models Replace any Seal Ring Pos 45 in the Chambers Pos 4 4a and 5a Inner edge must face downward see diagram Snap Seal Ring Retainer Pos 65 into place The retainer should not spin on the chamber and the seal ring should move freely from side to side With Shaft Pin Pos 10 inserted into the Shaft Pos 51 place shaft into Shaft Holder material 00SV0040 Reassembly Procedures CR CRI CRN 1se1 3 5 Place Sleeve O ring Pos 37 into recessed area of the Motor Stool Pos 2 for CR models or into the Pump Head Pos 77 for CRI CRN models Install Sleeve O ring Pos 37b into Pump Head Cover Pos 77a for CRI CRN Cool Top Back to Back Seal Tandem Seal models Install O ring into Suction Discharge Pump Housing Pos 6 Note specialty O ring Pos 37b will always be installed in the lower Hot section of the pump of Cool Top models Before reusing the original Shaft Pos 51 use a light grit emery cloth to smooth away old set screw marks as these can cut the O rings
12. late remained in the Pump Head Cover Pos 77a use a rubber mallet to free the plate and lift it off Remove the Cool Top assembly Pump Head Cover Pos 77a Light blows with a rubber mallet may be required to loosen assembly Use a 36 mm wrench or deep socket to loosen Unscrew the Connecting Pipe Pos 149 lift off and check the O rings Pos 109a amp b If damaged remove To continue proceed to step 18 GRUNDFOos 3 Dismantling Procedures CR CRI CRN 1se1 3e5 Back to Back Seal Back to Back Seal NOTE When performing the next step be aware there is spring tension against the Seal Driver Loosen but do not fully remove the two Set Screws Pos 113 of the Inboard Seal Driver Pos 112a Slide the driver up and off the shaft Remove the remaining components Larger Seal Driver Pos 112 Spring Pos 108 Small Seal Driver Pos 111 O ring Pos 107 Rotating Seal Face Pos 104 Remove the Pump Head Cover Loosen and remove the three 2 5 mm Hex Screws Pos 146 Remove the Stationary Seal Pos 77a Light blows with a rubber Retaining Washer Pos 148 Remove the Stationary Seal Pos 103 and O ring Pos 102 mallet may be required to loosen assembly p Use specialty tool OOSV2007 or a 36 mm deep socket to loosen Unscrew the Stationary Seal Retainer Pos 147 Lift off and check the O ring Pos 109a If damaged remove To continue proceed to step 18 4 GRUNDFOos Dismant
13. ling Procedures CR CRI CRN 1s 1e3 5 Tandem Quench Seal Tandem Quench Seal Slide the Inboard Seal Pos 105b up Loosen the three 2 5 mm Set Use specialty tool OOSV2007 or a and off the shaft Screws Pos 113 of the Inboard Seal 36mmdeepsockettoloosen Unscrew Pos 105b the Inboard Seal Remove the Pump Head Cover Pos 77a Light blows with a rubber mallet may be required to loosen assembly To continue proceed to step 18 GRUNDFOS gt 4 5 Dismantling Procedures CR CRI CRN 1se1 3 5 Grab the shaft and lift impeller stack out of the pump If it is stuck a light blow with a rubber mallet may be needed to jolt the stack free The bottom chamber Pos 5a may remain in the suction discharge chamber Liftthe Impeller Pos 49a offthe shaft If it comes off freely proceed to step 22 If itis stuck and cannot be removed by hand proceed to step 21 Remove the Chamber with bearing Pos 4a or Chamber Pos 4 If it is stuck to the rest of the stack pry it loose by inserting a screwdriver between the chambers 6 GRUNDFOS X Place the Holder for Shaft 00SV0040 in a vise With the shaft pin inserted into the shaft place the impeller stackinto the shaft holder Tighten vise Usinga13 mm wrench remove the Lock Nut Pos 67 Washer Pos 66 and Spacer Pos 64a Move the shaft into a hole of the shaft holder through which it can pass freely Screw the Punch for Dismantling Shaft materia
14. n over Remove sleeve O ring and stretch Replace and reinstall the pump head onto shaft and sleeve 4 GRUNDFOos Tandem Seal Slide the Inboard Seal Pos 105b down the shaft and thread into the pump head Use specialty tool OOSV2007 or a 36 mm deep socket to torque the Inboard Seal to 26 ft Ibs 35 Nm Do not tighten the three 2 5 mm set screws at this time this will be done after step 35 Spray soapy solution onto the Sleeve O rings Pos 37 in the Motor Stool ree 2 for standard CR or Pump Head Pos 77 for CRI CRN Lower and fully press into seat onto the Sleeve Pos 55 If they do not easily fit in place STOP Remove the pump head and turn over Remove sleeve O ring and stretch Replace and reinstall the pump head onto shaft and sleeve Reassembly Procedures CR CRI CRN 1s 1 3 5 Place the Washers Pos 66a over the Staybolts Pos 26 Lubricate with a light oil Placethe19 mm Staybolt Nuts Pos 36 onto staybolts and torque diagonally to CR CRI 29 5 ft lbs 40 Nm CRN 37 ft lbs 50 2 Nm Spray soapy water ontotheseal O ring seating surface of the Motor Stool Pump Head and Shaft Pos 51 Lower the new Shaft Seal Pos 105 over the shaft Use specialty tool OOSV2007 or a 36 Lowerthe motor onto the motor stool mm deep socket to torque Seal to 26 ft lbs 35 Nm Do not tighten the three 2 5 mm set screws at this time This will be done after step 34 Install Coupling Halves Apply
15. of the impeller back plate hub area must be compensated for Use a longer spacer or combination of spacers that equal the thickness of back plate hub area material 2 Since proper reassembly of the impeller stages must be done upside down this chart has been arranged that way for your convenience Impeller eyelet opening faces upward away from vise 3 Because the low NPSH chamber and impeller are twice the thickness of a standard chamber it has the performance of two impellers Physically there is one less chamber in a stack than the number of stages listed on the pump label example CR5 22 only has 21 chambers and impellers GRUNDFOS 1 be think innovate SM DRC 135 1011 The name Grundfos the Grundfos logo and be think innovate are registered trademarks owned by Grundfos Holding A S Denmark All rights reserved worldwide Copyright Grundfos Holding A S GRUNDFOS Pumps Corporation GRUNDFOS Canada Inc Bombas GRUNDFOS de Mexico S A de CV 17100 W 118th Terrace 2941 Brighton Road Boulevard TLC No 15 Olathe Kansas 66062 Oakville Ontario L6H 6C9 Canada Parque Industrial Stiva Aeropuerto Phone 913 227 3400 Phone 905 829 9533 Apodaca N L Mexico 66600 Fax 913 227 3500 Fax 905 829 9512 Phone 52 81 8144 4000 V www grundfos us Fax ee eal G RU N D FOS 4A
16. p destaged the thickness of the impeller back plate hub area must be compensated for Use a longer spacer or combination of spacers that equal the thickness of back plate hub area material lw WI N NIN N m oO OoOo N OAO 2 Since proper reassembly of the impeller stages must be done upside down this chart has been arranged that way for your convenience Impeller eyelet opening faces upward away from vise S wj w wiw POP A Y 20 GRUNDFOS X Reassembly Procedures CR CRI CRN 1se1 3 5 Order of Stage Assembly Models CR CRN 5 Low NPSH Legend 67 67 Lock Nut Lock Nut 66 66 Star Washer Star Washer 4la Bearing ring 4la Bearing ring 4a Chamber with bearing 64c 64c Clamp 4a Chamber with Clamp bearing 64e i a Spacing pipe pacing pipe 64d 49i ka Spacing pipe Impeller 49i Impeller 64a Spacing pipe 49 Impeller 64a Spacing pipe 49 64f Impeller spacing pipe Spacing pipe Part Combination A 69 Spacing pipe Part Combination B Part Combination B Number of chambers ea ax as Ga wh ne wa cel hl 12 13 14 15 16 18 20 22 24 26 29 32 36 J Stages Bottom cham pera 4 4 Chamber CPL Chamber CPL 64 Spacing Pipe Po u baad bannad poneed Pease amma mal 64 pacing rip Spacing Pipe 49 Impeller 49 Impeller 69 Spacing Pipe Part Combination C Part Combination D NOTES 1 If an impeller is to be permanently removed pump destaged the thickness
17. r Inspect the components for any After setting seal install plugs cause of binding Tighten the three 2 5 mm shaft seal securing screws Pos 113 to the shaft Finish torque of 2 ft lbs 2 5 Nm THE PUMP F F a IS NOW a COMPLETELY E E ASSEMBLED Installthe Coupling Guards tighten the Screws Pos 7a Torque to 2 ft lbs 2 5 Nm 16 GRUNDFOS X Reassembly Procedures CR CRI CRN 1se1 3 5 Order of Stage Assembly Models CR I N 1s 1 3 Legend f 41a 67 Bearing Ring OF ca Lock Nut Spacing Pipe 4a 66 Star Washer Chamber with Bearing 4 64c E Chamber CPL Clamp 64a Spacing Pipe 49 Chamber CPL Impeller 69 Spacing Pipe 49 49 Impeller Impeller Part Combination D a es J l stage Bottom chamber NOTES 1 If an impeller is to be permanently removed pump destaged the thickness of the impeller back plate hub area must be compensated for Use a longer spacer or combination of spacers that equal the thickness of back plate hub area material 2 Since proper reassembly of the impeller stages must be done upside down this chart has been arranged that way for your convenience Impeller eyelet opening faces upward away from vise GRUNDFOS v Reassembly Procedures CR CRI CRN 1se1 3 5 Order of Stage Assembly Models CR CRN3 Low NPSH Legend 67 f 41a Lock Nut _ Bearing Ring 64 Spacing Pipe 69 66 64a ee Spacing Pipe
18. screwdriver remove Coupling Remove the Hex Head Coupling Bolts Guard Screws Pos 7a Then remove Pos 9 from the Coupling Halves the Coupling Guards Pos 7 Pos 10a Remove Coupling Halves the wires will aid in reinstallation and the Shaft Pin Pos 10 required Color coding or numbering Remove the cartridge Shaft Seal Pos 105 by Loosening the three 2 5 mm Shaft Seal Securing Allen Screws Pos 113 Do not fully remove screws as this may cause the seal assembly to come apart in component form Remove the Motor Bolts Pos 28 and lift the motor off the Motor Stool Pos 2 Using 0OSV2007 or a 36 mm deep socket Fully unscrew the Shaft Seal from the Motor Stool Pos 2 or Pump Head Pos 77 on and N models Slide the Shaft Seal up and off the Shaft Pos 51 Remove the Motor Stool Pos 2 and Pump Head Pos 77 on and N models Light upward blows with a rubber mallet may be required Remove the four 19 mm Staybolt Nuts Pos 36 and Washers Pos 66a e If the pump is a standard unit skip to step 18 e For Cool Top type equipped pumps see steps 7 to 9 e Pumps built with a Back to Back Seal see steps 10 to 13 e Pumps built with Tandem Quench Seal see steps 14 to 17 2 GRUNDFOs Dismantling Procedures CR CRI CRN 1se1 3e5 Cool Top Cool Top If the Disk Plate Pos 79 remained in the Pump Head Pos 77 use a punch and rubber mallet to drive the plate out If the Disk P
19. y Procedures CR CRI CRN 1se1e3 5 Back to Back Seal Back to Back Seal Position the plugs to the desired Install the Inboard Rotating Shaft Seal Pos 104 O ring Pos 107 Small Seal Driver ea nettle Lae ue Pos 111 Make sure the tabs of the driver clear the tabs of the rotating seal Next install CO acne Mie Son oho me E Ea ve h Spring Pos 108 followed by the Large Seal Driver Pos 112 andseat onthe Sleeve Pos 55 Ifit does Mi Calapan Po ye tollomed Dy tie Tale geal aiver ross 12 not freely seat onto the sleeve STOP Remove the pump head and turn over Remove sleeve O ring and stretch Replace and reinstall the pump head onto shaft and sleeve NOTE When performing the next step be aware there is spring tension against the Seal Driver Lower the Seal Driver Pos 112a Proper shaft seal positioning from top of shaft and seal tab engagement Proceed to Engage the slot of Pos 112a with the step 25 tabs of Pos 112 Tighten the two Set Screws Pos 113 to 2 ft lbs 2 5 Nm Ameasurementof 92mm or 3 6 inches from the top of the shaft to the upper edge of driver112a must be maintained See step 22 GRUNDFOS gt 4 13 Reassembly Procedures CR CRI CRN 1se1e3 5 Tandem Seal Position the plugs to the desired location Lower the completed Pump Head Assembly Pos 77a over the shaft andseatonthe Sleeve Pos 55 Ifitdoes not freely seat onto the sleeve STOP Remove the pump head and tur
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